Spark-plug.



L. ROSE.

SPARK PLUG.

APPLICATION FILED JAN. 21. 1915.

1,178,538. Patent-ed Apr. 11, 1916.

v Leonard/13050, I WITNESSES INVENTQRM ATTORNEY LEONARD ROSE, OF NEW ORLEANS, LOUISIANA.

srAnK-rnue.

specification of Letters latent. I t t APR 1 1 1 Application filed January 21, 1915. Serial No. 8,572.

To all whom it may concern Be it known that I, LEONARD Rose, a subject of the King of Great Britain, residing at New Orleans, in the parish of Orleans and State of Louisiana, have invented a new and useful Spark-Plug, of which the following is a specification.

This invention has reference to spark plugs, and is designed to provide a spark plug wherein access of oil and soot to the insulating member ofthe spark plug is prevented and the cleansing of the interior of the spark plug from accumulations of either oil or soot or both is facilitated.

.In' accordance with the present invention the spark plug comprises a body' member which may be made, as is the custom, of a metal, such. as brass, and within the body portion is a chamber or cavlty opening through the sparking end of the plug by way .of a suitable passage traversed by the insulated terminal or electrode, while the other end of the chamber is closed by the corresponding end of a porcelain or other insulating block through which the stem of the central terminal extends, and beyond which such stem is accessible. y

The present invention. has todo with the so-called anti-soot type of spark plugs, and

in such spark plugs trouble has been experienced from short-circuiting due to accumulations of oil and soot or other foreign matter on the porcelain or other suitable insulator.

By the present invention any soot or oil which may find its way into the interior of plug is directed into an'inverted cup which in turn directs any such matter to the bottom of the internal chamber where it is entirelyharmless,-and from which the accumulated matter may be removed from time to time as needed without removing the spark plug from the engine.

The invention will be best understood from a consideration of the following detailed description taken in connection with the ac- -companying drawings forming a partof this specification with the further understanding that while the drawlngs show a practical form of the inventiomthelatter is not confined to any strict conformity wlth the. showing of the drawings, but may be.

,modified so long as .suchchangesand modifications mark no material changed and departure from the. salient features of .the invention.

In the drawings :---Figure l is an elevation of a spark plug constructed in accord ancewith the present invention. Fig 2 is a longitudlna'l diametric section. Fig. 3 is a section on the line 33 of F ig.2.

Referring to the drawings there is shown a body member 1 inclosing a chamber 2, and

at one end provided with an axial externally threaded neck 3 having an. axial bore 4 therethrough. The end of the body member 1 remote from the neck 3 is formed into a laterally expanded and axially extended cup 5 provided with internal screwthreads and externalplane faces arranged to form the customary hexagonal nut for the application of a tool. At the junction of the chamber 2 with the interior of the cup 5 there is formed a shoulder 6.

Adapted to the cup. 5 is one end of a elongated block 7 usually of porcelain, but

be referred to as a porcelain block without,

however, any limitation of this part of the structure to such specific material.

As a convenient means for holding the porcelain block 7 in the cup 5 the block is formed at that end entering the cup with an exterior radially extended flange 8 which may be clamped against the shoulder 6 through the intermediary of a gasket 9 usually, though .not necessarily, a copper gasket. Applied to the other face of the flange 8 from the gasket 9 isa second sealing gasket 10 which may also be a copper or other like gasket.

Screwed into the cup 5 is the customary annular nut 11 having a rim 12 at one end for the application'of a tool, wherefore this rim is usually made of hexa-j gonal contour. When the nut 12 is screwed into place the flange 8 is held between two sealing gaskets which may both be alike with the gasket 9 against the shoulder 6, so that leakage of gases of explosion is prevented.

Extending longitudinally through the block 7 .is a passage1l3 traversed by a metal stem 14 having at one end ahead 15 which in the particular showing of the drawings ispassage 4 and the head 15 is of a diameter that it may'traverse thepassage 4. The stem 14 substantially corresponds in diameter to the passage l3so'as so-fitthe porcelain block but little less than that of the passage 4 s0 easily and yet comparatively snugly. lhe rod or stem 14 is threaded for an approprlate distance, the threaded portion being longer than the length of the block '7 and the stem is of sufficient length to extend beyond the outer or upper end of the block 7 when the head 15 is beyond or below the free or lower end of the neck 3. Applied to the stem 1st above the block 7 is a nut 15" with washers 16 of some suitable softmaterial which is appropriately resistant to heat. Ordinarily asbestos washers 16 are employed. The nut 15* may have its exterior milled for conven ience of manipulation, or it may be otherwise formed for the application of a tool; Beyond the nut 15 the rod l i receives a clamp nut 17 which in the particular showing of the drawings is provided with a handle 18, but it will be understood that any form of nut whereby an electric conductor may be clamped against the nut 15 may be employed. A I

Within the chamber 2 which is traversed by the rod or stem 1a with its threaded portion entering the chamber, is a cup 19 having at its closed end a hub 20 appropriately axially threaded so that the cup may be screwed along the rod or stem lt with the cup concentric with the rod, and its open end directed toward the neck end of the body 1. Rising from the bottom of the chamber :2, considering the spark plug as upright, is a tube 21 with its interior constituting a continuation of the bore 4C. l'Chis tube 21 is of sufficient length to enter the lower open end of the cup 19 for a portion of the depth of the cup and the tube opens toward the closed end of the cup while the open end or" the cup opens toward the bottom of the chamber 2.

By a suitable adjustment of the nut 15 the central terminal represented by the head 15 is brought into proper relation to the lower end of the neck 3 which constitutes the other terminal or the spark plug. This adjustment" may be properly made before the plug is introduced into the engine, and may be afterward changed as circumstances may demand by removing the body a of the plug from the engine.

lVith a spark plug such as described the head 15 when quite close to the neck 3 prevents to some extent access of oil or soot or both through the passage 4, but it is not at all detrimental to the proper operation of the spark plug for oil or soot or both or other material to find its way into the interiorof the spark plug through the passage at and tubeQl, since such material does not then reach the porcelain block T where facing the chamber 2, because it IS deflected therefrom by the inverted cup 19. The oil or soot may under the force of the explosion enter the v chamber 2 under considerable headway, but

to the interior of the spark plug on reaching the interior of the cup 19 the direction of movement of such oil or soot is changed, so that instead of following initial direction of movement toward block 7 such. course is changed, whereby soot and oil are deflected toward the bee tom of the chamber 2 where such materials may accumulate without harm, since they can neither reach the porcelain block 7 nor the central stem 14:, wherefore there is no possibility of a short circuit being estab lished and the operation of the spark plug being prevented thereby.

The cup 19 serves both the purpose lock nut for the stem 1t and a deflector 11o any oil, soot or other material proje into the interior of the spark plug tow-e d the porcelain insulator, wherefore such ma terial cannot reach the insulator and so to the detriment of the electrical eiiicieney of, the spark plug. I

Th chamber 2 is readily cleansed of cumulations' from time to time by r ing the block 7 and parts carried thereby- What'is claimed is 1. A. spark plug comprising a body tion with an interior chamber accessib c gases of explosion through the active end or the plug, a block of insulating mat 1 closing that end of the chamber remote ."ti the active end of the spark plug, a rod tending through the block of insulatin material and chamber and screw-threac for, the greater portion of its length wlu. by the screw threads extend beyond born ends of the insulating block, and said rod having a spark plug terminal in operative relation. to the active end of the plug, a cup threaded on the rod within the chamber with the mouth of the cup in the path of incoming gases of explosion and material ca ried thereby for diverting such materi away from the insulating block, and a tubular duct for the gases of explosion within the chamber and telescoping into the cup toward the closed end thereof.

2. A spark plug comprising a body member with a chamber therein opening tin-oi h the active end of the plug and there accessible to gases of explosion, a block ct insulating material carried by the body n1ernher and forming a closure for that end of the chamber remote from the active end the plug, a threaded stem extending lent f wise through the block and through the active end of the plug and there provided a 1; a spark terminal, the threaded portion the stem being of a length to project beyo' both ends of the block of insulating rial, a cup within the chamber threaded on the rod and having its mouth in the path gases of explosion entering the chambe duct within the chamber for directing t gases of explosion into the cup, m duct being telescoped into the. cup,

clamp nut applied to the end of the rod projecting beyond the insulating block at the end of the latter remote from the chamber and ,coacting with the threaded cup to damp the rod to the insulating block to provide for adjustment ofthe spark plug terminal carried by the rod with relation to the active end of the spark plug and With the cup always in the same relation to the tubular duct irrespective of such adjust 10 ments.

R. O. DIoKEy, VVALTEI: L. Nonwoon;

fiopies of this patent may be obtained for five cents each, by addressing the "Commissioner of Patents,

' Washington, D, G. 

